30501-29-2 EINECS 250-223-4 Tetrachloro-di-p-xylylene Tetrachlorotricyclo(8.2.2.24,7)hexadeca-1(12),4,6,10,13,15-hexaene, mixed isomers Tricyclo(8.2.2.24,7)hexadeca-4,6,10,12,13,15-hexaene, tetrachloro-